Portable grinding stand



H. W. NICHOLSON PORTABLE GRINDING STAFD Aug. 24, 1948.

Filed Oct. 29, 1947 Har'pw W. Nichol son Patented Aug. 24, 1948 V UNITED STATES PATENT OFFICE PQRTABLE GRINDING STAND Harlow w. Nicholson, Elwood, m. Refiled for abandoned; application Serial No.

688,437, August 5, 1946. This application Oc-' tuber 29, 1947, Serial N 0. 782,859

V 3 Claims. 1 v This invention relates to improvements in port able grinding or abrading stands audit is the purpose of this invention to provide a stand the parts of which are both detachable and adjustable whereby disk harrows may be sharpened without removing the disk blades from the barrow.

It is also an object of this invention to provide a motorsupport comprising a platform upon which the motor maybe adjustably supported and leveled.

It is a further object of this invention to pro vide a construction that may be manufactured in large quantities at a low initial cost.

Other objects and advantagestvill be revealed in the detailed description of the accompanying drawings which form a part of this specification.

In the drawings:

Fig. 1 is a view in sideelevation with portions of the shaft support shown in vertical longitudinal "section.

Fig. 2 is alsoa view in side elevation with portions thereof in vertical longitudinal section, the upper portion of the stand being adjusted to its lowermost position.

Fig. 3 is a view in transverse section taken approximately on the'line 3--3 of Fig. 1 looking in the direction of the arrows.

The drawings are merely illustrative of the essential parts and portions of my invention and are not definitive thereof except :as pointed out in the subject matter claimed herein.

The reference characters identify the parts and portions specified in the detailed description of the drawings.

In the drawings the base I "is made up of one long part 2 and short parts s ands preferably made of suitable channel iron or steel. "The adjacent ends of parts 3 and 4' are welded to the long part 2 as clearly indicated at 4, 5, 6 and 1. The free remote ends of the parts 'or members 2, '3 land 4" are provided with upright foot portions .3, :9, :lfl and H which are welded to thebase membersras shown at l2.

The base zl is provided with :an upright standard or shaft 13 having its :lower end welded to the member 2 as shown at M. The shaft 13 is substantially at right angles to the base I and forms therewith the lower section of my stand construction.

The upper portion of the stand is constructed of tubular material united to form a T-shaped section IS. The leg or upright portion l6 of the T-shaped section telescopically receives the upright standard 13. The leg 16 is provided with a set screw IT to prevent rotation of the leg 15 aboutthe standard 13 when such a condition may be required. The-leg it is secured to tubular support 28 by. welding the same together. as shown at 20.

. In order to maintain a selected elevational adiustment the standard 12 is provided with a collar {3 having a set screw '49. The cotlar .1! is slidable along the standard is and may be so cured in any desiredposltion of adjustment by the set screw l9. Of course, vertical or elevational adjustment may also be made by the use of the set screw i1.

The horizontal portion 19 of the 'F-shapedseotion 15 contains a horizontal shaft 2-?! which it screw threaded at both ends to receive locking collars 2 2, 23 and locking nuts 24 and 25. The grinding or abs-ailing wheel 28 secured axially on the shaft by a locked collar 22 and lockin nuts 24. collars may be keyed in adiusted positions or they may be secured in adjusted positions by as set screw as shown at Hi.

The pulley, preferably a v -pulley, 23 is hecured on other end of the shaft 2%! thy means similar to :or identical "with the means to secure the wheel .15 in fixed axial position on the shait 21, or the pulley may be keyed on the shaft.

, The shafttfi supported preferably in bohhit bearings 29 and 30.

.leg llfiiis' provided with an adiustable platform 3| constituting .=a support for an =:eiectr1c motor 351, located as shown, in the drawings directlyhut in spaced relation, below the shah; 2i; One end portion of the platform 23! is provided with slotted portions 32, 33, 3J4, 35 where by motor 35 :and its ill-shaped pulley 31 may be adjusted to alignment. with the *Vqmlley 22!. The pulleys "are pperatively connected to each other :by the M-belt 38 as clearly shown in Fig. 1.

end of the platform is provided with an interrupted flange '39 produced by a substantially centrally located notched portion. .Eln order to .adirus'tahly secure the platform 31 ion the leg ill; :a notched clamping bar H is used.

' Both :the clamping bar 41 and. the interrupted flange 3:9 are provided two pairs of opentures. Each pair being arranged in alignment to receive clamping bolts 42 and 43. The clamping means for the platform 3| provides for distance adjustment of the motor 36 and its pulley 31 relative to the pulley 28 whereby the proper adjustment of the belt 38 may be readily maintained for successful operation.

The motor 36 is supported on sets of shims 44. Bolts 45, 46 etc., pass through apertured ears on the motor casing and also through the shims 44 :and the slotted portions 32, 33, 34 and 35 of the platform. The use of shims provides for both leveling and adjusting the motor 36 relative of the platform 3| and relative of the pulley 28. It it to be noted that I have provided a triple adjustment means for the motor 36 relatively of the pulley 28.

The beveled edge portions of the interrupted flange 39 bear directly against the tube It and prevent the platform 3| from sagging when in clamped position.

The use of guards for the grinding wheel 26, the pulleys 28 and 31, and the belt 38 is contemplated, but are not shown on the drawings.

Other varieties of grinding wheels, not shown, such as a sickle grinding wheel, may be substituted when it is desired to do sickle grinding.

Since the motor 36 is detachable from the stand, it may be removed therefrom and used for other purposes.

When it is desired to grind the disk of a disk harrow, the harrow is placed upon a suitable platform, not shown, so that the work is suitably accessible to the operator or operators. At least, one disk section of the harrow is supported in sufliciently elevated position so that it may be rotated by hand or otherwise. With the disk section in the position above described the disks are ready for grinding without removin them from the harrow.

The portable grinding stand is now brought into position by whatever adjustments may be found necessary to bring the circumference of the grinding wheel 2i into proper sharpening contact with a single disk, As the grinding proceeds the disk section is rotated so that the sharpening may be accomplished accurately and umformly. After one disk is sharpened my portable grinder stand is shifted to the next disk of the harrow section being operated upon and this disk sharpened in the same way as the first disk. This operation is repeated until all of the disks on all of the sections of the harrow are sharpened.

It is to be noted that my new portable stand is provided with ample adjusting means whereby the grinding wheel may be adjusted to any particular position both as to elevation and as to angularity.

The elevational adjustment is accomplished by the collar l8 and its set screw i9.

The angular adjustment is accomplished by the set screw ll which impinges against the standard [3 and prevents relative rotation of the Ileg l6 and the standard [3.

If free swinging of the top section I is desired :it is merely necessary to loosen the set screw ll.

When the work or object to be ground cannot be moved to the grinding wheel 26, the T-section may be removed from the base section and carried to the work and held in operative grinding position thereon.

The platform Si is reversible, that is, it may be used either side up as a matter of choice to suit conditions. The reversibility affords an additional adjustment not previously pointed out,

whereby adjustments may be made to dliferent lengths of transmission belts.

This is a refiled application of Harlow Nicholson, Serial No. 688,437, filed Aug. 5, 1946, for Portable grinding stands. Said application inadvertently became abandoned Aug, 7, 1947.

Having fully described my invention and the operation thereof, what I claim is:

1. A portable grinding stand, said stand comprising upper and lower sections, said upper section being composed of tubular stock secured together to form a T-shaped member, the lower section having a base supporting a standard substantially at a right angle thereto and located centrally thereon, the leg of the T-shaped member telescopically receives the standard of the lower section, the standard is provided with means adjustably mounted thereon to maintain the elevational adjustment of the T-shaped member which it engages and supports, the leg of the T-shaped member forms the support for a motor platform adjustably secured thereto, the horizontal portion of the T-shaped member contains and supports a rotatable shaft, one end of said shaft being provided with an abrading wheel secured thereon, the opposite end of the shaft being provided with a pulley fixedly secured thereon, in combination with an electric motor mounted on said platform, said motor having a driving pulley in alignment with the pulley on the rotatable shaft, said pulleys being operatively connected by a suitable transmission belt.

2. In a portable grinding stand, said stand comprising upper and lower detachable sections, said lower section composed of cross members rigidly secured together and supporting a standard centrally thereof and substantially at right angles thereto, the upper section being composed of tubular stock, said stock being rigidly secured together to form a T-shaped member the leg of which telescopically receives the standard of the lower section, in combination with means penetrating said leg and impinging against said standard to prevent angular movement between said sections, said standard having means thereon to support said upper section when said angular movement preventing means is loosened.

3. In a portable grinding stand, said stand having upper and lower sections telescopically and detachably connected together, said upper section being composed of tubular stock secured together in the form of a T-shaped member, the leg of the T-shaped member being welded to the cross portion of said member to make a firm and rigid connection therewith, said cross portion having a shaft supported therein by babbit bearings, said shaft havin means thereon for securing a grinding wheel on one of its ends and a driven pulley on the opposite end thereof, said leg having a motor suporting platform adjustably secured thereto and supporting a motor thereon with its driving pulley in alignment with the shaft pulley, said pulleys being operatively connected by a suitable transmission belt.

HARLOW W. NICHOLSON. 

